Glass articles coated with silica-based parting agent and methods of ceramming the same

Patent metadata

Field	Value
Publication number	US-11820698-B2
Application number	US-202117336582-A
Country	US
Kind code	B2
Filing date	Jun 2, 2021
Priority date	Jun 3, 2020
Publication date	Nov 21, 2023
Grant date	Nov 21, 2023

Abstract

Coated glass articles for a glass-ceramic ceramming process including a parting agent coated on a surface of the glass article. The parting agent coating can comprise an aqueous dispersion comprising amorphous silicon dioxide agglomerate particles and a dispersant. The parting agent coating can be dried to forming a parting layer for glass articles in a glass stack for a ceramming process that transforms the glass articles into glass-ceramic articles.

First claim

What is claimed is:

1. A coated glass article, comprising:
a glass article comprising:
a first surface;
a second surface opposite the first surface; and
a parting agent coated on the first surface of the glass article, the parting agent comprising an aqueous dispersion comprising amorphous silicon dioxide agglomerate particles and a dispersant,
wherein the parting agent comprises 10 wt % to 30 wt % of the amorphous silicon dioxide agglomerate particles, and
wherein the parting agent comprises a pH in a range of 8.5 to 11.

2. The coated glass article of claim 1 , wherein the dispersant comprises a hydroxide or an acid.

3. The coated glass article of claim 1 , wherein the dispersant comprises a hydroxide.

4. The coated glass article of claim 3 , wherein the hydroxide is sodium hydroxide.

5. The coated glass article of claim 1 , wherein the parting agent comprises 0.25 wt % to 1 wt % of the dispersant.

6. The coated glass article of claim 1 , wherein the amorphous silicon dioxide agglomerate particles comprise a mean particle size in a range of 100 nanometers to 20 microns.

7. The coated glass article of claim 1 , wherein the parting agent further comprises a colloidal inorganic binding agent.

8. The coated glass article of claim 7 , wherein the colloidal inorganic binding agent comprises colloidal silicon dioxide.

9. The coated glass article of claim 1 , wherein the parting agent comprises a viscosity in a range of 5 cP to 160 cP.

10. The coated glass article of claim 1 , wherein the parting agent is not coated on the second surface of the glass article.

11. The coated glass article of claim 1 , wherein the dispersant adheres the amorphous silicon dioxide agglomerate particles to the first surface of the glass article.

12. A method of ceramming a plurality of glass articles, the method comprising:
coating a parting agent on a first surface of a first glass article, the parting agent comprising an aqueous dispersion comprising amorphous silicon dioxide agglomerate particles and a dispersant, wherein the parting agent comprises 10 wt % to 30 wt % of the amorphous silicon dioxide agglomerate particles, and wherein the parting agent comprises a pH in a range of 8.5 to 11;
drying the parting agent on the first surface of the first glass article;
positioning a second glass article in direct contact with the dried parting agent to form a glass stack comprising the first glass article, the second glass article, and the dried parting agent; and
exposing the glass stack to a ceramming cycle sufficient to ceram the first glass article and the second glass article into glass-ceramic articles.

13. The method of claim 12 , wherein the dried parting layer is directly adhered to the first surface of the first glass article, and wherein the dried parting layer is in direct contact with a second surface of the second glass article and is not adhered to the second surface of the second glass article.

14. A coated glass article, comprising:
a glass article comprising:
a first surface;
a second surface opposite the first surface; and
a parting agent coated on the first surface of the glass article, the parting agent comprising an aqueous dispersion comprising amorphous silicon dioxide agglomerate particles, a dispersant, and a colloidal inorganic binding agent,
wherein the parting agent comprises a pH in a range of 8.5 to 11.

15. The coated glass article of claim 14 , wherein the parting agent comprises a viscosity in a range of 5 cP to 160 cP.

16. The coated glass article of claim 15 , wherein the parting agent comprises 10 wt % to 30 wt % of the amorphous silicon dioxide agglomerate particles.

17. The coated glass article of claim 14 , wherein the colloidal inorganic binding agent comprises colloidal silicon dioxide.

18. A coated glass article, comprising:
a glass article comprising:
a first surface;
a second surface opposite the first surface; and
a parting agent coated on the first surface of the glass article, the parting agent comprising an aqueous dispersion comprising amorphous silicon dioxide agglomerate particles and a dispersant,
wherein the parting agent comprises a pH in a range of 8.5 to 11, and
wherein the parting agent comprises a viscosity in a range of 5 cP to 160 cP.

19. The coated glass article of claim 18 , wherein the parting agent further comprises a colloidal inorganic binding agent, the colloidal inorganic binding agent comprising a colloidal oxide.

20. The coated glass article of claim 19 , wherein the parting agent comprises 90 wt % to 100 wt % of a sum of water, the dispersant, the colloidal inorganic binding agent, and the amorphous silicon dioxide agglomerate particles.

Assignees

• Corning Inc

Inventors

• Hall Jill Marie
• Patil Mallanagouda Dyamanagouda
• Ridge John Richard
• Wheeler Elizabeth Margaret
• Zahradka Michael Aaron
• Ziegenfus Christine Marie

Classifications

• C03B40/033 Primary

  Means for preventing adhesion between glass and glass · CPC title

• C03B32/02

  Thermal crystallisation, e.g. for crystallising glass bodies into glass-ceramic articles {(C03B27/012 takes precedence)} · CPC title

• C03C17/25

  by deposition from the liquid phase · CPC title

• C03C2217/213

  SiO2 · CPC title

• C03C2218/11

  from solutions or suspensions · CPC title